Two Sedans with some similarities, but otherwise different in most aspects such as the model year, powertrain, horsepower, fuel economy, ground shadow size, and height. First of all, the 2013 S80 has bigger and thirstier engine; the 2016 3 Series Sedan Diesel gets 12.5 more mpg. Also, the 3 Series Sedan Diesel body is slightly smaller than the S80, and in addition to that, it's also shorter. Among similarities are the body structure, market segment, starting price, and maximum occupancy.